#YoutubeでTutorial & Template Channel作りました。
http://www.timetoedit.net/
https://www.youtube.com/channel/UCy6tHV_d458fg2VwKp5HGHQ/
#考え方はCSSに近いのかも
いつもScriptUIを作りながら悩んでたんですが、考え方を少し変えてみました。
結構細かく、グループを作ってやっていたら思い通りのレイアウトになりました。
２カラム的な考え方にして右と左と２面で考えてエディットテキストの列を綺麗に揃えてみました。
cssだとパディングやマージンですが、スペーシングやマージングなんてcssっぽいやつもextendscriptにもあったんですね。
参考URL: http://jongware.mit.edu/scriptuihtml/Sui/index_1.html
#理解しやすく画像でも説明
上のグループだけですが、あとは同じ様な事をやっているだけです。
とりあえずボックスでまとめるという感じです。
##コード
var thisFile = new File(this); //jsxのファイルを取得
var thisFolderPath = thisFile.path; //jsxのフォルダパスを取得


//~ ~~~~~~~~~~~~~~~Scriot UI ~~~~~~~~~~~~~~~

var winObj = (this instanceof Panel) ? this : new Window('palette', 'Auto Slide Show', undefined, {resizeable: true});

    var contentsGrp = winObj.add('group',undefined,'contentsGrp');
    contentsGrp.orientation = 'column';
        try{
        var myBannerPath = new File (thisFolderPath+'/youtool_common/Ae_Script_banner.png');
        var banner = contentsGrp.add('image',undefined,myBannerPath);
        banner.alignment = [ScriptUI.Alignment.LEFT,ScriptUI.Alignment.CENTER];
        //~     banner.alignment = [ScriptUI.Alignment.LEFT,ScriptUI.Alignment.CENTER]
        }
        catch(e){
        }

var box01 = [0,0,60,20];
var box02 = [0,0,70,20];

    var tab = contentsGrp.add('tabbedpanel');
        var tabSetting = tab.add('tab',undefined,'Set');
        var tabEdit = tab.add('tab',undefined,'Edit');
        tabSetting.alignChildren = 'left';
            var compSettingPnl = tabSetting.add('panel',undefined,'comp Setting');
                var compSettingGrp = compSettingPnl.add('group',undefined,'compSettingGrp');
                compSettingGrp.orientation = 'row';
                compSettingGrp.alignment = [ScriptUI.Alignment.LEFT,ScriptUI.Alignment.CENTER];
                    var compSettingGrpLeft = compSettingGrp.add('group',undefined,'compSettingGrpLeft');
                    compSettingGrpLeft.orientation = 'column';
                    compSettingGrpLeft.alignChildren = 'left';
                    compSettingGrpLeft.add('statictext',undefined,'Width:');
                    compSettingGrpLeft.add('statictext',undefined,'Height:');
                    compSettingGrpLeft.add('statictext',undefined,'PAR:');
                    compSettingGrpLeft.add('statictext',undefined,'FrameRate:');
                    
                    var compSettingGrpRight = compSettingGrp.add('group',undefined,'compSettingGrpRight');
                    compSettingGrpRight.orientation = 'column';
                    compSettingGrpRight.alignChildren = 'left';
                        var compSettingGrpRightGrp001 = compSettingGrpRight.add('group',undefined,'001');
                        compSettingGrpRightGrp001.orientation = 'row';
                        compSettingGrpRightGrp001.add('edittext',box01,'1920');
                        compSettingGrpRightGrp001.add('statictext',undefined,'px');
                        var compSettingGrpRightGrp002 = compSettingGrpRight.add('group',undefined,'002');
                        compSettingGrpRightGrp002.orientation = 'row';
                        compSettingGrpRightGrp002.add('edittext',box01,'1080');
                        compSettingGrpRightGrp002.add('statictext',undefined,'px');
                        var compSettingGrpRightGrp003 = compSettingGrpRight.add('group',undefined,'003');
                        compSettingGrpRightGrp003.add('edittext',box01,'1.0');
                
                        var compSettingGrpRightGrp004 = compSettingGrpRight.add('group',undefined,'004');
                        compSettingGrpRightGrp004.orientation = 'row';
                        var FRDDL = compSettingGrpRightGrp004.add('dropdownlist',box01);
                        FRDDL.add('item','8');
                        FRDDL.add('item','12');
                        FRDDL.add('item','15');
                        FRDDL.add('item','23.976');
                        FRDDL.add('item','24');
                        FRDDL.add('item','25');
                        FRDDL.add('item','29.97');
                        FRDDL.add('item','30');
                        FRDDL.add('item','50');
                        FRDDL.add('item','59.94');
                        FRDDL.add('item','60');
                        FRDDL.add('item','120');
                        FRDDL.selection = 7;
                        compSettingGrpRightGrp004.add('statictext',undefined,'fps');



            var pictureSettingPnl = tabSetting.add('panel',undefined,'pictureSetting');
                var pictureSettingPnlGrp = pictureSettingPnl.add('group',undefined,'pictureSettingPnlGrp');
                pictureSettingPnlGrp.orientation = 'row';
                pictureSettingPnlGrp.alignment = [ScriptUI.Alignment.LEFT,ScriptUI.Alignment.CENTER];
                    var pictureSettingPnlGrpLeft = pictureSettingPnlGrp.add('group',undefined,'pictureSettingPnlGrpLeft');
                    pictureSettingPnlGrpLeft.orientation = 'column';
                    pictureSettingPnlGrpLeft.alignChildren = 'left';
                        var durEdit = pictureSettingPnlGrpLeft.add('statictext',undefined,'Duration:');     
                        var zoomEdit = pictureSettingPnlGrpLeft.add('statictext',undefined,'ZoomSpeed:'); 
                        var animationscall = pictureSettingPnlGrpLeft.add('statictext',undefined,'animation scall:'); 

                    var pictureSettingPnlGrpRight = pictureSettingPnlGrp.add('group',undefined,'pictureSettingPnlGrpRight');
                    pictureSettingPnlGrpRight.orientation = 'column';
                    pictureSettingPnlGrpRight.alignChildren = 'left';
                        var compSettingGrpRightGrp001 = pictureSettingPnlGrpRight.add('group',undefined,'compSettingGrpRightGrp001');
                        compSettingGrpRightGrp001.orientation = 'row';
                        var user_compDuration = compSettingGrpRightGrp001.add('edittext',box02,'00:00:05:00'); 
                        var compSettingGrpRightGrp002 =pictureSettingPnlGrpRight.add('group',undefined,'compSettingGrpRightGrp002');
                        compSettingGrpRightGrp002.orientation = 'row';
                        compSettingGrpRightGrp002.add('edittext',box02,'10'); 
                        compSettingGrpRightGrp002.add('statictext',undefined,'%/Dur'); 

                        var compSettingGrpRightGrp003 =pictureSettingPnlGrpRight.add('group',undefined,'compSettingGrpRightGrp003');
                        compSettingGrpRightGrp003.orientation = 'row';
                        var scallAniList = compSettingGrpRightGrp003.add('dropdownlist',undefined); 
                        scallAniList.add('item','none');
                        scallAniList.add('item','Up');
                        scallAniList.add('item','Down');
                        scallAniList.add('item','Ramdom');
                        scallAniList.selection = 3;


            var FinalCompSettingPnl = tabSetting.add('panel',undefined,'FinalCompSettingPnl');
                var FinalCompSettingPnlGrp = FinalCompSettingPnl.add('group',undefined,'FinalCompSettingPnllGrp');
                FinalCompSettingPnlGrp.orientation = 'column';
                FinalCompSettingPnlGrp.alignChildren = 'left';     
                    var FinalCompSettingPnlGrpGrp001 = FinalCompSettingPnlGrp.add('group',undefined,'FinalCompSettingPnlGrpGrp001');
                        var overRap = FinalCompSettingPnlGrpGrp001.add('checkbox',undefined,'OverLap'); 
                    var FinalCompSettingPnlGrpGrp002 = FinalCompSettingPnlGrp.add('group',undefined,'FinalCompSettingPnlGrpGrp001');
                    FinalCompSettingPnlGrpGrp002.orientation = 'row';
                        var FinalCompSettingPnlGrpLeft = FinalCompSettingPnlGrpGrp002.add('group',undefined,'pictureSettingPnlGrpLeft');
                        FinalCompSettingPnlGrpLeft.orientation = 'column';
                        FinalCompSettingPnlGrpLeft.alignChildren = 'left';           
                            var FinalCompSettingPnlGrpLeftGrp001 = FinalCompSettingPnlGrpLeft.add('statictext',undefined,'Duration:');     
                            var FinalCompSettingPnlGrpLeftGrp002 = FinalCompSettingPnlGrpLeft.add('statictext',undefined,'Transition:');             
         
                        var FinalCompSettingPnlGrpRight = FinalCompSettingPnlGrpGrp002.add('group',undefined,'FinalCompSettingPnlGrpRight');
                        FinalCompSettingPnlGrpRight.orientation = 'column';
                        FinalCompSettingPnlGrpRight.alignChildren = 'left';           
                            var FinalCompSettingPnlGrpRightGrp001 = FinalCompSettingPnlGrpRight.add('group'); 
                            FinalCompSettingPnlGrpRightGrp001.orientation = 'row';
                                var FCEditText = FinalCompSettingPnlGrpRightGrp001.add('edittext',box02,'00:00:01:00'); 
                                
                            var FinalCompSettingPnlGrpRightGrp002 = FinalCompSettingPnlGrpRight.add('group'); 
                            FinalCompSettingPnlGrpRightGrp002.orientation = 'row';
                                var FCTransitionGrp = FinalCompSettingPnlGrpRightGrp002.add('group'); 
                                var FCTiList = FCTransitionGrp.add('dropdownlist',undefined); 
                                var FCTdef = FCTiList.add('item','Off');
                                FCTiList.add('item','Dissolve the front layer');
                                FCTiList.add('item','Cross dissolve  front  and back layer');
                                FCTiList.selection = FCTdef;

                                FinalCompSettingPnlGrpRight.enabled = false;    
                                FinalCompSettingPnlGrpRight.enabled = false;
                                
            var buttonGrp = tabSetting.add('group',undefined,'buttonGrp');
            buttonGrp.orientation = 'row';
            buttonGrp.alignment = [ScriptUI.Alignment.RIGHT,ScriptUI.Alignment.CENTER];

        //Button
            var csvLoadBtn = buttonGrp.add('button',undefined,'Load CSV');
            var executionBtn = buttonGrp.add('button',undefined,'Execution');

//~ ~~~~~~~~UI setting~~~~~~~~
tabSetting.spacing = 20;
tabSetting.margins = 10;

compSettingGrpLeft.spacing = 18;
compSettingGrpLeft.margins = 0;

pictureSettingPnlGrpLeft.spacing = 18;
pictureSettingPnlGrpLeft.margins = 0;    

FinalCompSettingPnlGrpLeft.spacing = 18;
FinalCompSettingPnlGrpLeft.margins = 0;    

//~ ~~~~~~~~UI setting~~~~~~~~

winObj.onResizing = winObj.onResize = function () {this.layout.resize();};  

if (winObj instanceof Window) {  
winObj.center();  
winObj.show();  
} else {  
winObj.layout.layout(true);  
winObj.layout.resize();  
}  

user_compDuration.onDeactivate = function(){
var temp = user_compDuration.text;
var b = currentFormatToTime(temp, Math.ceil(FRDDL.selection.toString()), false);
var c = timeToCurrentFormat(b, Math.ceil(FRDDL.selection.toString()), false);
user_compDuration.text =c;
}


FCEditText.onDeactivate = function(){
var temp = FCEditText.text;
var b = currentFormatToTime(temp, Math.ceil(FRDDL.selection.toString()), false);
var c = timeToCurrentFormat(b, Math.ceil(FRDDL.selection.toString()), false);
FCEditText.text =c;
}


overRap.onClick = function(){
    if (overRap.value){
    FinalCompSettingPnlGrpRight.enabled = true;    
    }
    else{
    FinalCompSettingPnlGrpRight.enabled = false;    
    }   
}