Scaling not working for a child window with respect to Parent Window

Development Programming & Scripting
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1

I have create a child (SWindow) of a Parent Window(SWindow) . The Child window is a part of a Compound Widget class

pDialogMainWindow = SNew(SWindow)
.Title(FText::FromString(“RealBand”))
.ClientSize(FVector2D(1100, 800))
.SupportsMaximize(false)
.SupportsMinimize(false)
.SizingRule(ESizingRule::UserSized)
.AutoCenter(EAutoCenter::PreferredWorkArea)
.SupportsMaximize(true)
.SupportsMinimize(true)

  	//.ShouldPreserveAspectRatio(true)
  	//.IsTopmostWindow(true)
  	[
                        [
  		SAssignNew(pOverlay, SOverlay)
  	
                            + SCanvas::Slot()
  	.HAlign(HAlign_Fill)
  	.VAlign(VAlign_Fill)
  	.Size(FVector2D(950.0f, 700.0f))
  		.Position(FVector2D(140.0f, 45.0f))
  	[
                            // Child Window Widget 
  		SAssignNew(pRealBandImportSettings, RealBandImportSettingsUI)
  		
  	]

];

The issue is when I re size the parent window the child window does not scale with respect to its parent window