property XMLGrid.LevelWidth(Level as Long) as Long
Returns or sets a value that indicates the width of the level.

TypeDescription
Level as Long A long expression that inidcates the level being resized. The 0 Level indicates the first level. The 1 Level indicates the second level and so on.
Long A long expression that indicates the width of the level, in pixels.
Use the LevelWidth property to specify the level's width. The control fires the ResizeLevel event when user resizes a level. Use the Level property to get the node's level. Use the VisibleLevelCount property to specify the number of levels being displayed. You can use the ResizeToFit method to resize the visible levels to fit the visible node content.

The following sample specify a minimum width for the first level:

Private Sub XMLGrid1_ResizeLevel(ByVal Level As Long)
    If Level = 0 Then
        With XMLGrid1
            If .LevelWidth(Level) < 64 Then
                .LevelWidth(Level) = 64
            End If
        End With
    End If
End Sub