public void createData()
{
m_data = new SpaceGraphData();
m_data.OnRootChanged = onRootChanged;
m_data.OnHoverItemChanged = onHilightChanged;
m_data.OnSelectedItemsChanged = onHilightChanged;
}
//-----------------------------------------------------------------------------------------
void onHilightChanged(SpaceGraphData _data)
{
Invalidate();
}
//-----------------------------------------------------------------------------------------
void onRootChanged(SpaceGraphData _data)
{
Inactivate();
}