Why cannot I dock the workspace window?

Why cannot I dock the workspace window?

For help: the vc6 work panel is out of order, and the workspace becomes a normal window (with our. h. CPP file window), the current workspace does not appear on the left of the editing box, but a file window, I switch to a file in the project, such as. CPP will overwrite the workspace.
In addition, the workspace window has a minimum and maximum small-size worker

Symptom: Right-click the image and choose "Docking View" from the shortcut menu.

Solution: Select properties under the View menu. An empty window is displayed. Close the window and right-click the blank area in the workspace to display the pop-up menu. Select "Docking View"

Reference: http://topic.csdn.net/t/20040831/10/3325017.html