Hi Guys,

 I have a question, I use the AddCustomButton method of the API TaskpaneView to add a button to the task pane. When I drag the task pane, a residual image appears.

The following is what a normal task pane looks like：

Here's what the task pane looks like after you drag it：

As shown in the picture above, there will be pixel residue on the right side after dragging, and some code will be attached