I want to position a modal dialog (progress window) at the top right corner of the parent window client area.

This code will put it in the corner of the non-client area, but how do I calculate the offset to the client area?

this.Owner=owner;
this.Left=owner.Left+owner.ActualWidth-Width;
this.Top=owner.Top;

Edit:

I found this 'solution' that works for normal windows:

this.Left=owner.Left+owner.ActualWidth-Width-SystemParameters.ResizeFrameVerticalBorderWidth;
this.Top=owner.Top+SystemParameters.ResizeFrameHorizontalBorderHeight+SystemParameters.WindowCaptionHeight;

This would however fail for windows that have customized borders.

EDIT:

The code should work regardless of the systems DPI setting (e.g. 120 instead of 96).