private void stageDifRotZTB_TextChanged(object sender, EventArgs e)
{
float i = 0;
if (float.TryParse(stageDifRotZTB.Text, out i))
{
stageDifRotZTB.BackColor = Color.White;
selectedStageLight.setRotZ(i);
}
else
{
stageDifRotZTB.BackColor = Color.Red;
}
stageRotZTrackBar.Value = (int)(i + 180.0f);
}