private void button_KeyDown(object sender, KeyEventArgs e)
{
// Тут надо роспознать кординати миши относительно Panel
}
int CursorToFormX = this.PointToClient(Cursor.Position).X;
int CursorToFormY = this.PointToClient(Cursor.Position).Y;
int SizeTreeView = treeView1.Size.Width + 18;
int PositionPasteX = (SizeTreeView - CursorToFormX) - (SizeTreeView - CursorToFormX) - (SizeTreeView - CursorToFormX);
int SizeCaptionAndMenuStrip = int.Parse(SystemInformation.CaptionHeight.ToString()) + 6;
int PositionPasteY = (SizeCaptionAndMenuStrip - CursorToFormY) - (SizeCaptionAndMenuStrip - CursorToFormY) - (SizeCaptionAndMenuStrip - CursorToFormY);