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I want to open a Window via ShowDialog() in a WPF application and it should show exactly above two controls in the application's MainWindow.

I can position the Window correctly in terms of X and Y / Top and Left but I cannot get the height and width to match the controls underneath. The Window is always showing narrower and shorter.

I am using the following code:

Private Sub Button_Click_1(sender As Object , e As RoutedEventArgs) Me.UpdateLayout() Me.sbmSideBarManager.UpdateLayout() Me.sbcFolders.UpdateLayout() Me.sbcFilters.UpdateLayout() Dim lVisiblePropertiesDialog As New VisiblePropertiesDialog Dim lSideBarManagerPoint As Point = Me.sbmSideBarManager.TranslatePoint(New Point(0,0), Me.sbmSideBarManager) Dim lSideBarManagerLocation As Point = Me.sbmSideBarManager.PointToScreen(lSideBarManagerPoint) lVisiblePropertiesDialog.WindowStartupLocation = Windows.WindowStartupLocation.Manual lVisiblePropertiesDialog.Top = lSideBarManagerLocation.Y lVisiblePropertiesDialog.Left = lSideBarManagerLocation.X lVisiblePropertiesDialog.Height = Me.sbmSideBarManager.ActualHeight lVisiblePropertiesDialog.Width = (Me.sbcFolders.ActualWidth + Me.sbcFilters.ActualWidth) lVisiblePropertiesDialog.ShowDialog()

End Sub

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  • Width and height include the size of the borders and the window caption. But you care about the client area size when you want controls to fit. Read this. Commented Mar 7, 2016 at 14:15
  • Thank you. That'll help me when calculating the space needed to remove border area etc but I need the real ActualWidth and ActualHeight of the controls in my MainWindow and the properties with the same names are giving me something else. Commented Mar 7, 2016 at 15:59
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