private void OnGUI()
{
if (_graphGuiEditor == null)
{
return;
}
var width = position.width;
var height = position.height;
// Main graph area
_graphGuiEditor.BeginGraphGUI(this, new Rect(0, 0, width, height - _barHeight));
_graphGuiEditor.OnGraphGUI();
_graphGuiEditor.EndGraphGUI();
}