Hi Ozcan Oksuz,
Thank you for contacting us.
When using:
you wrap the window (ToolWindow instance) in a HostWindow. To access its Tag you could use the code:
Here Content is your instance of ToolWindow.
For the specific case of using ToolWindow we recommend using the DockWindow method of RadDock:
In this case you can access the Tag of the window with the code:
Hope it helps.
Regards,
Alexander
the Telerik team
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