of the target document. Click a visible control directly in the document, rest the mouse for a moment so that a copy of the control is added to the drag-and-drop clipboard, then drag the copy into the other document. If you want a copy in the same document, press
中。在文档中直接单击可见的控件，让鼠标在上面停留片刻以便于将该控件的副本添加到拖放剪贴板中，然后将该副本拖到另一个文档中。如果要在同一个文档中复制，请在拖动时按住