Why ComboBox hides cursor when DroppedDown is set?

Question

Let\'s create WinForms Application (I have Visual Studio 2008 running on Windows Vista, but it seems that described situation takes place almost everywhere from Win98 to Vis

Answer 1

In fact I was able to resolve this issue in this way:

#region Dirty methods :)
#pragma warning disable 169
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern void mouse_event(long dwFlags, long dx, long dy, long cButtons, long dwExtraInfo);

private const int MOUSEEVENTF_ABSOLUTE = 0x8000;
private const int MOUSEEVENTF_MOVE = 0x1;
private const int MOUSEEVENTF_LEFTDOWN = 0x02;
private const int MOUSEEVENTF_LEFTUP = 0x04;
private const int MOUSEEVENTF_RIGHTDOWN = 0x08;
private const int MOUSEEVENTF_RIGHTUP = 0x10;
#pragma warning restore 169
#endregion

private void button1_Click(object sender, EventArgs e) {
   Point oldCursorPos = Cursor.Position; // save pos
   Point a = comboBox1.Parent.PointToScreen(comboBox1.Location);
   a.X += comboBox1.Width - 3;
   a.Y += comboBox1.Height - 3;
   Cursor.Position = a;
   // simuate click on drop down button
   mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, 0, 0, 0, 0);
   Cursor.Position = oldCursorPos; // restore pos
}

But it is not the solution I want :( It is rather a crutch but not a solution.