static void GanttCtrl::step1_GridStepCalcCbk(GridStepManager& gridStepManager, CoordinateConverter& coordConv) {
	const unsigned int nbMaxSteps = GridStepManager::NB_MAX_STEPS; //gridStepManager.GetNbMaxSteps();
	GridStepData* gridStepData = gridStepManager.GetGridStepData();
	TypeGraphCoord gridStepValue = 1;
	TypeGraphCoord gridStartValue = GridStepManager::GetGridStartValue( gridStepValue, coordConv.getGraphMin() );

	unsigned int nbSteps = (unsigned int)tabs((coordConv.getGraphMax() - gridStartValue) / gridStepValue);
	
	if (nbSteps > nbMaxSteps) {
		nbSteps = nbMaxSteps;
	}
	gridStepManager.SetNbSteps(nbSteps);

	// fill step values ==> used by gridStepIterator
	for (unsigned int c=0; c<nbSteps+1; ++c) {
		gridStepData[c].stepGraphValue = gridStartValue + gridStepValue*c;
		gridStepData[c].drawTickText = 0;// ==> draw tick text not needed (from you're screen shot)
	}
}

	GetY1GridAxisDraw().GetGridStepManager().setCustomGridSteps(STDBACK(step1_GridStepCalcCbk));