Mouse Move not captured when button is pushed

Hi All

I have created a very handy mouse zoom routine for excel charts that makes a selection rectangle follow the mouse and then zooms in on the selected area. Microsoft should have provided this feature long ago, but now I have done it.

My problem is that, when the mouse button is pressed (as in a drag and drop) my mouse move event sub doesn't fire. It works fine when I release the mouse button. The following code in a class module shows what I have written:

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Does anyone understand this problem? I also want to make a pan routine but want to hold the mouse button while dragging.