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The ASPxPopupControl supports the Transparency feature, which means you can create custom-shaped popup windows. For this purpose, set the control's BackColor property to 'Transparent' and provide the appropriate background image.

In this demo, puzzle elements are represented by ASPxPopupControl instances. Each puzzle element's shape is defined by a specific partially transparent .png image, which is set as the background image of the corresponding popup control (via the control's BackgroundImage property). The BackColor property of each popup control is set to 'Transparent'. To allow popup windows to be dragged, the AllowDragging property is set to true and the DragElement property is set to Window, for each popup control.

Local Copy of this Demo
To inspect the source code for this demo on your machine, you must first install our components via the DevExpress Component Installer.
You can open a local copy of this online demo directly from this webpage (if using v20.2.8, 21.1.4 or higher).
Open CS Solution
Open VB Solution
The source code files for this demo are installed (by default) in the following directories:
\Users\Public\Documents\DevExpress Demos XX.X\Components\ASP.NET\CS\ASPxDockAndPopupsDemos
\Users\Public\Documents\DevExpress Demos XX.X\Components\ASP.NET\VB\ASPxDockAndPopupsDemos