WPF - Set dialog window position relative to main window?

Question

I\'m just creating my own AboutBox and I\'m calling it using Window.ShowDialog()

How do I get it to position relative to the main window, i.e. 20px from the top and

Answer 1

I would go the manual way, instead of count on WPF to make the calculation for me..

System.Windows.Point positionFromScreen = this.ABC.PointToScreen(new System.Windows.Point(0, 0));
PresentationSource source = PresentationSource.FromVisual(this);
System.Windows.Point targetPoints = source.CompositionTarget.TransformFromDevice.Transform(positionFromScreen);

AboutBox.Top = targetPoints.Y - this.ABC.ActualHeight + 15;
AboutBox.Left = targetPoints.X - 55;

Where ABC is some UIElement within the parent window (could be Owner if you like..) , And could also be the window itself (top left point)..

Good luck