Use the ExpandOnKeys property to specify whether the control expands or collapses a node when user presses arrow keys. By default, the ExpandOnKeys property is True. Use the ExpandOnDblClick property to specify whether the control expands or collapses a node when user dbl clicks a node.  The ExpandOnSearch property specifies whether the control expands nodes when incremental searching is on ( AutoSearch property is different than 0 ) and user types characters when the control has the focus. If the ExpandOnKeys property is False, the user can't expand or collapse the items using the + or - keys on the numeric keypad. Use the ExpandItem property to programmatically expand or collapse an item. In CardView mode, the ExpandOnKeys property allows expanding or collapsing the cards using the + or - keys on the numeric keypad.

The following VB sample expands or collapses the focused item if the user presses the + or - keys on the numeric keypad, and  ExpandOnKeys property is False:

Private Sub Grid1_KeyDown(KeyCode As Integer, Shift As Integer)
    With Grid1.Items
        If (KeyCode = vbKeyAdd) Then
            .ExpandItem(.FocusItem) = True
        End If
        If (KeyCode = vbKeySubtract) Then
            .ExpandItem(.FocusItem) = False
        End If
    End With
End Sub

The following C++ sample expands or collapses the focused item if the user presses the + or - keys on the numeric keypad, and  ExpandOnKeys property is False:

#include "Items.h"
void OnKeyDownGrid1(short FAR* KeyCode, short Shift) 
{
	CItems items = m_grid.GetItems();
	switch ( *KeyCode )
	{
		case VK_ADD:
		case VK_SUBTRACT:
		{
			items.SetExpandItem( items.GetFocusItem(), *KeyCode == VK_ADD ? TRUE : FALSE );
			break;
		}
	}
}

The following VB.NET sample expands or collapses the focused item if the user presses the + or - keys on the numeric keypad, and  ExpandOnKeys property is False:

Private Sub AxGrid1_KeyDownEvent(ByVal sender As Object, ByVal e As AxEXGRIDLib._IGridEvents_KeyDownEvent) Handles AxGrid1.KeyDownEvent
    Select Case (e.keyCode)
        Case Keys.Add
            With AxGrid1.Items
                .ExpandItem(.FocusItem) = True
            End With
        Case Keys.Subtract
            With AxGrid1.Items
                .ExpandItem(.FocusItem) = False
            End With
    End Select
End Sub

The following C# sample expands or collapses the focused item if the user presses the + or - keys on the numeric keypad, and  ExpandOnKeys property is False:

private void axGrid1_KeyDownEvent(object sender, AxEXGRIDLib._IGridEvents_KeyDownEvent e)
{
	if ( ( e.keyCode == Convert.ToInt16(Keys.Add)  ) || (e.keyCode == Convert.ToInt16(Keys.Subtract) ) )
		axGrid1.Items.set_ExpandItem( axGrid1.Items.FocusItem, e.keyCode == Convert.ToInt16(Keys.Add) );
}

The following VFP sample expands or collapses the focused item if the user presses the + or - keys on the numeric keypad, and  ExpandOnKeys property is False:

*** ActiveX Control Event ***
LPARAMETERS keycode, shift

with thisform.Grid1.Items
	if ( keycode = 107 )
		.DefaultItem = .FocusItem
		.ExpandItem(0) = .t.
	else
		if ( keycode = 109 )
			.ExpandItem(0) = .f.
		endif
	endif
endwith