The DefaultInsideZoomFormat property defines the format of the inside zoom units. By default, the inside zoom units displays hours. The DefaultInsideZoomFormat property is applied to all inside zoom units, that has AllowCustomFormat property on False ( by default ). The InsideLabel property defines the label of the units once they get magnified. The control fires the InsideZoom event once the user magnifies a date. The inside zoom units are displayed only if the AllowInsideZoom property is True ( by default, the AllowInsideZoom property is False ). 

The following VB sample shows how can I change the scale unit when doing inside zoom ( the chart displays weeks, and we want week days ):

With G2antt1
	.BeginUpdate 
	With .Chart
		.ShowNonworkingDates = False
		.PaneWidth(0) = 0
		.LevelCount = 2
		With .Level(0)
			.Label = "<%mmmm%>"
			.Unit = exMonth
		End With
		With .Level(1)
			.Label = "<%ww%>"
			.Unit = exWeek
		End With
		.FirstVisibleDate = #1/1/2008#
		.AllowInsideZoom = True
		With .DefaultInsideZoomFormat
			.OwnerLabel = "<font ;7><%mmm%> Week: <%ww%>"
			.InsideLabel = "<font ;7><b><%d1%></b>"
			.InsideUnit = exDay
		End With
		With .InsideZooms
			.SplitBaseLevel = False
			.Add #2/3/2008#
		End With
	End With
	.EndUpdate 
End With

The following VB.NET sample shows how can I change the scale unit when doing inside zoom ( the chart displays weeks, and we want week days ):

With AxG2antt1
	.BeginUpdate 
	With .Chart
		.ShowNonworkingDates = False
		.PaneWidth(0) = 0
		.LevelCount = 2
		With .Level(0)
			.Label = "<%mmmm%>"
			.Unit = EXG2ANTTLib.UnitEnum.exMonth
		End With
		With .Level(1)
			.Label = "<%ww%>"
			.Unit = EXG2ANTTLib.UnitEnum.exWeek
		End With
		.FirstVisibleDate = #1/1/2008#
		.AllowInsideZoom = True
		With .DefaultInsideZoomFormat
			.OwnerLabel = "<font ;7><%mmm%> Week: <%ww%>"
			.InsideLabel = "<font ;7><b><%d1%></b>"
			.InsideUnit = EXG2ANTTLib.UnitEnum.exDay
		End With
		With .InsideZooms
			.SplitBaseLevel = False
			.Add #2/3/2008#
		End With
	End With
	.EndUpdate 
End With

The following C++ sample shows how can I change the scale unit when doing inside zoom ( the chart displays weeks, and we want week days ):

/*
	Copy and paste the following directives to your header file as
	it defines the namespace 'EXG2ANTTLib' for the library: 'ExG2antt 1.0 Control Library'

	#import <ExG2antt.dll>
	using namespace EXG2ANTTLib;
*/
EXG2ANTTLib::IG2anttPtr spG2antt1 = GetDlgItem(IDC_G2ANTT1)->GetControlUnknown();
spG2antt1->BeginUpdate();
EXG2ANTTLib::IChartPtr var_Chart = spG2antt1->GetChart();
	var_Chart->PutShowNonworkingDates(VARIANT_FALSE);
	var_Chart->PutPaneWidth(0,0);
	var_Chart->PutLevelCount(2);
	EXG2ANTTLib::ILevelPtr var_Level = var_Chart->GetLevel(0);
		var_Level->PutLabel("<%mmmm%>");
		var_Level->PutUnit(EXG2ANTTLib::exMonth);
	EXG2ANTTLib::ILevelPtr var_Level1 = var_Chart->GetLevel(1);
		var_Level1->PutLabel("<%ww%>");
		var_Level1->PutUnit(EXG2ANTTLib::exWeek);
	var_Chart->PutFirstVisibleDate("1/1/2008");
	var_Chart->PutAllowInsideZoom(VARIANT_TRUE);
	EXG2ANTTLib::IInsideZoomFormatPtr var_InsideZoomFormat = var_Chart->GetDefaultInsideZoomFormat();
		var_InsideZoomFormat->PutOwnerLabel(L"<font ;7><%mmm%> Week: <%ww%>");
		var_InsideZoomFormat->PutInsideLabel(L"<font ;7><b><%d1%></b>");
		var_InsideZoomFormat->PutInsideUnit(EXG2ANTTLib::exDay);
	EXG2ANTTLib::IInsideZoomsPtr var_InsideZooms = var_Chart->GetInsideZooms();
		var_InsideZooms->PutSplitBaseLevel(VARIANT_FALSE);
		var_InsideZooms->Add("2/3/2008");
spG2antt1->EndUpdate();

The following C# sample shows how can I change the scale unit when doing inside zoom ( the chart displays weeks, and we want week days ):

axG2antt1.BeginUpdate();
EXG2ANTTLib.Chart var_Chart = axG2antt1.Chart;
	var_Chart.ShowNonworkingDates = false;
	var_Chart.set_PaneWidth(0 != 0,0);
	var_Chart.LevelCount = 2;
	EXG2ANTTLib.Level var_Level = var_Chart.get_Level(0);
		var_Level.Label = "<%mmmm%>";
		var_Level.Unit = EXG2ANTTLib.UnitEnum.exMonth;
	EXG2ANTTLib.Level var_Level1 = var_Chart.get_Level(1);
		var_Level1.Label = "<%ww%>";
		var_Level1.Unit = EXG2ANTTLib.UnitEnum.exWeek;
	var_Chart.FirstVisibleDate = "1/1/2008";
	var_Chart.AllowInsideZoom = true;
	EXG2ANTTLib.InsideZoomFormat var_InsideZoomFormat = var_Chart.DefaultInsideZoomFormat;
		var_InsideZoomFormat.OwnerLabel = "<font ;7><%mmm%> Week: <%ww%>";
		var_InsideZoomFormat.InsideLabel = "<font ;7><b><%d1%></b>";
		var_InsideZoomFormat.InsideUnit = EXG2ANTTLib.UnitEnum.exDay;
	EXG2ANTTLib.InsideZooms var_InsideZooms = var_Chart.InsideZooms;
		var_InsideZooms.SplitBaseLevel = false;
		var_InsideZooms.Add("2/3/2008");
axG2antt1.EndUpdate();

The following VFP sample shows how can I change the scale unit when doing inside zoom ( the chart displays weeks, and we want week days ):

with thisform.G2antt1
	.BeginUpdate
	with .Chart
		.ShowNonworkingDates = .F.
		.PaneWidth(0) = 0
		.LevelCount = 2
		with .Level(0)
			.Label = "<%mmmm%>"
			.Unit = 16
		endwith
		with .Level(1)
			.Label = "<%ww%>"
			.Unit = 256
		endwith
		.FirstVisibleDate = {^2008-1-1}
		.AllowInsideZoom = .T.
		with .DefaultInsideZoomFormat
			.OwnerLabel = "<font ;7><%mmm%> Week: <%ww%>"
			.InsideLabel = "<font ;7><b><%d1%></b>"
			.InsideUnit = 4096
		endwith
		with .InsideZooms
			.SplitBaseLevel = .F.
			.Add({^2008-2-3})
		endwith
	endwith
	.EndUpdate
endwith