Controls in RadPanel redraw slowly when changing the Enabled state of the panel.
Workaround:
private void radButton1_Click(object sender, EventArgs e)
{
if (this.radPanel1.Enabled)
{
this.radPanel1.Enabled = false;
}
else
{
this.radPanel1.Visible = false;
this.radPanel1.Enabled = true;
this.radPanel1.Visible = true;
}
}