how to make values automatically updated when renderscenedialog get changed?

 
try (destroydialog testing) catch()
Rollout testing "one"	
(
 
 
	spinner widthres "W:"   
			range:[0,10000,0] 
			width:60 
			type:#integer 
			align:#left
			tooltip: "output width"
 
			on widthres changed val do try 
				(
					(RenderWidth = widthres.value)/(getRendImageAspect())
					renderSceneDialog.update()	 
				) catch()
 
	spinner heightres "H:"   
			range:[0,10000,0] 
			width:60 
			type:#integer 
			align:#right
			tooltip: "output height"
			pos: (widthres.pos+[20,0])
		on heightres changed val do try 
			(
				(Renderheight = heightres.value)/(getRendImageAspect())
				renderSceneDialog.update()	 
			) catch()
 
	checkbutton lockratio ""
			pos: (heightres.pos+[14,0])
			width: 16 height: 16
			tooltip: "lock image aspect ratio"
		on lockratio changed state do try 
			(
				( 	if state == 1 then getRendImageAspect = true
					else ( 	if state == 0 then getRendImageAspect = true) 	
					renderscenedialog.update)
				) catch()
 
	dropdownList areatorender "area to render :"   
			tooltip:"area to render"
			items:#("view","region","crop","blowup")	
			align: #center
			on areatorender selected sell do try 
			(   case areatorender.selection of
				(	1: ( setRenderType #view; EditRenderRegion.IsEditing = false() )
					2: ( setRenderType #region; EditRenderRegion.EditRegion() )
					3: ( setRenderType #crop; EditRenderRegion.EditRegion() )
					4: ( setRenderType #blowup; EditRenderRegion.EditRegion() )
				) 
			)catch()
 
			spinner autobackuptime_SPN ""   
					range:[0,100,15] 
					width:40 
					type:#float				
					tooltip: "autobackup timing in minute"
					enabled: false
				on autobackuptime_SPN changed val do 
				(autosave.Interval = autobackuptime_SPN.value) 
 
			checkbox autobackup_CB "autobackup" 
				checked:false 
				pos: (autobackuptime_SPN.pos+[-115,0])
				on autobackup_CB changed state do try (
					(	autosave.enable = state
						autobackuptime_SPN.enabled = not autobackuptime_SPN.enabled
					)
				) catch ()
 
			mapbutton environment_Mbtn "<<none>>"
				on environment_Mbtn picked texmap do try (
					(
					environmentmap = texmap
					environment_Mbtn.text=classof texmap as string
					)
				) catch ()
 
		on testing open do
		(	
			try (
					widthres.value = renderwidth;
					heightres.value = renderheight
					lockratio.state = getRendImageAspect
					areatorender.selection = getRenderType
					autobackuptime_SPN.value = autosave.interval
					autobackup_CB.state = autosave.enable
				)
			catch()
		)  
 
		on testing mousemove pos do --lbuttondown 
		(	
			try (
					widthres.value = renderwidth; 
					heightres.value = renderheight
					lockratio.state = getRendImageAspect
					areatorender.selection = getRenderType
					autobackuptime_SPN.value = autosave.interval
					autobackup_CB.state = autosave.enable
				)
			catch()	
		)
 
)
createdialog testing  width:170 pos: [10,100]--menu:<RCMenu>