You want to write a simple print design program, how to implement the interface selected TAB and can drag size, is actually like lodop controls, can put your own tags, and can be selected, the selected after can drag and drop size and so on, selected border will appear after six points on behalf of the selected operating state,
Have any examples and tutorial, I have not found,

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Baidu search relevant keywords,

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Handle mouse events, according to the location of the mouse drawing size and location of the label,

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MSDN with the cases of application of drag component function

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