ZForge.Controls.XPTable.Editors.DropDownCellEditor.ShowDropDown C# (CSharp) Method

        protected virtual void ShowDropDown()
        {
            Point p = this.EditingTable.PointToScreen(this.TextBox.Location);
            p.Y += this.TextBox.Height + 1;

            Rectangle screenBounds = Screen.GetBounds(p);

            if (p.Y + this.dropDownContainer.Height > screenBounds.Bottom)
            {
                p.Y -= this.TextBox.Height + this.dropDownContainer.Height + 1;
            }

            if (p.X + this.dropDownContainer.Width > screenBounds.Right)
            {
                ICellRenderer renderer = this.EditingTable.ColumnModel.GetCellRenderer(this.EditingCellPos.Column);
                int buttonWidth = ((DropDownCellRenderer) renderer).ButtonWidth;

                p.X = p.X + this.TextBox.Width + buttonWidth - this.dropDownContainer.Width;
            }

            this.dropDownContainer.Location = p;

            this.parentForm.AddOwnedForm(this.dropDownContainer);
            this.activationListener.AssignHandle(this.parentForm.Handle);

            this.dropDownContainer.ShowDropDown();
            this.dropDownContainer.Activate();

            // A little bit of fun.  We've shown the popup,
            // but because we've kept the main window's
            // title bar in focus the tab sequence isn't quite
            // right.  This can be fixed by sending a tab,
            // but that on its own would shift focus to the
            // second control in the form.  So send a tab,
            // followed by a reverse-tab.

            // Send a Tab command:
            NativeMethods.keybd_event((byte) Keys.Tab, 0, 0, 0);
            NativeMethods.keybd_event((byte) Keys.Tab, 0, KeyEventFFlags.KEYEVENTF_KEYUP, 0);

            // Send a reverse Tab command:
            NativeMethods.keybd_event((byte) Keys.ShiftKey, 0, 0, 0);
            NativeMethods.keybd_event((byte) Keys.Tab, 0, 0, 0);
            NativeMethods.keybd_event((byte) Keys.Tab, 0, KeyEventFFlags.KEYEVENTF_KEYUP, 0);
            NativeMethods.keybd_event((byte) Keys.ShiftKey, 0, KeyEventFFlags.KEYEVENTF_KEYUP, 0);
        }