Gets or sets a popup window's (or dock panel's) part available for drag and drop operations.
One of the DragElement enumeration values.
The DragElement property specifies which part of a popup window (or a dock panel) can be dragged to move the element within the page. Two variants are available: header dragging (the window can be moved only by dragging its header), and window dragging (the window can be moved by clicking anywhere within its client area, holding down the mouse button and then moving the mouse cursor).
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