DevComponents Knowledge Base

private void frm_Load(object sender, EventArgs e)
{
    sideBar1.MouseMove += new MouseEventHandler(sideBar1_MouseMove);
    sideBar1.MouseWheel += new MouseEventHandler(sideBar1_MouseWheel);
}
 
void sideBar1_MouseMove(object sender, MouseEventArgs e)
{
    sideBar1.Focus();
}
 
void sideBar1_MouseWheel(object sender, MouseEventArgs e)
{
    if (e.Delta < 0)
    {
        if (sideBar1.ExpandedPanel.TopItemIndex < sideBar1.ExpandedPanel.SubItems.Count - 1)
            sideBar1.ExpandedPanel.TopItemIndex = sideBar1.ExpandedPanel.TopItemIndex + 1;
    }
    else
    {
        if (sideBar1.ExpandedPanel.TopItemIndex > 0)
            sideBar1.ExpandedPanel.TopItemIndex = sideBar1.ExpandedPanel.TopItemIndex - 1;
    }
}

Private Sub frm_Load(sender As Object, e As EventArgs)
    sideBar1.MouseMove += New MouseEventHandler(AddressOf sideBar1_MouseMove)
    sideBar1.MouseWheel += New MouseEventHandler(AddressOf sideBar1_MouseWheel)
End Sub
 
Private Sub sideBar1_MouseMove(sender As Object, e As MouseEventArgs)
    sideBar1.Focus()
End Sub
 
Private Sub sideBar1_MouseWheel(sender As Object, e As MouseEventArgs)
    If e.Delta < 0 Then
        If sideBar1.ExpandedPanel.TopItemIndex < sideBar1.ExpandedPanel.SubItems.Count - 1 Then
            sideBar1.ExpandedPanel.TopItemIndex = sideBar1.ExpandedPanel.TopItemIndex + 1
        End If
    Else
        If sideBar1.ExpandedPanel.TopItemIndex > 0 Then
            sideBar1.ExpandedPanel.TopItemIndex = sideBar1.ExpandedPanel.TopItemIndex - 1
        End If
    End If
End Sub