I have a CToolbar and within it I have a button with style BTNS_BUTTON|BTNS_DROPDOWN. I would like to make it a split button, so the left side of the button is a button, and the right side has a drop down menu. I have a CToolbar and within it I have a button
阅读背景：
为什么BTNS_DROPDOWN样式导致整个工具栏向下移动几个像素？
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