//-------------
private void M_btnZoomout_Click(object sender, EventArgs e)
{
if (m_dialogZoom == null)
{
m_dialogZoom = new Dlg_Zoom();
m_dialogZoom.FormClosing += M_dialogZoom_FormClosing;
}
m_dialogZoom.Show();
}
private void M_dialogZoom_FormClosing(object sender, FormClosingEventArgs e)
{
m_dialogZoom = null;
}
