private void OnColorBackgroundClicked(object sender, EventArgs e)
{
if((m_uBlockEvents > 0) || (m_bdc != BinaryDataClass.RichText)) return;
Color clr;
if(ShowColorDialog(m_rtbText.SelectionBackColor, out clr))
{
m_rtbText.SelectionBackColor = clr;
UpdateUIState(true, true);
}
}