摘要：
组打印。鼠标向下+=GroupBox1_鼠标向下；#区域弹出层移动[System.Runtime.InteropServices.DllImport（“user32.dll”，EntryPoint=“ReleaseCapture”）]publicstaticexternvoidReleaseCapture（）；[System.Runtime.Interop
groupPrint.MouseDown += GroupBox1_MouseDown;
#region 弹出层移动
[System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "ReleaseCapture")]
public static extern void ReleaseCapture();
[System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "SendMessage")]
public static extern void SendMessage(int hwnd, int wMsg, int wParam, int lParam);
private void GroupBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
ReleaseCapture();
SendMessage((int)groupPrint.Handle, 0xA1, 2, 0);
}
}