private void backgroundColorToolStripMenuItem_Click(object sender, EventArgs e)
{
ColorDialog dlg = new ColorDialog();
if (dlg.ShowDialog() != DialogResult.OK)
{
return;
}
mRenderView.SetBackgroundColor(dlg.Color.R / 255.0f, dlg.Color.G / 255.0f, dlg.Color.B / 255.0f, 1);
}