I am woking on a VSTO Excel Addin and on a button click i am opening a WPF form.

case 1 : I am working on a citrix environment and citrix opened on a single screen now i open excel and click on my ribbon button and my wpf form is working fine.
But when i drag my cirtix window from single monitor to dual monitor and my wpf form goes blank as present is screen shot.

case 1 : I am working on a citrix environment and citrix opened on a dual screen(on both the screens) now i open excel and click on my ribbon button and my wpf form is working fine.
But when i drag my cirtix window from dual monitor to single monitor and my wpf form goes blank same as above.

I am using show dialog for displaying WPF form.

`var prepareViewForm = new WpfContainerForm(objPrepareView, (int)Globals.ThisAddIn.Application.Width, (int)Globals.ThisAddIn.Application.Height);
prepareViewForm.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
prepareViewForm.HideWindowBezel();

var result = prepareViewForm.ShowDialog();`

I have tried changing properties
StartPosition from CenterParent to mannual.
Tried fixing the positions of the form but also not work.

How can i fix this problem?