By default, the RightToLeft property is False. The RightToLeft gets or sets a value indicating whether control's elements are aligned to right or left. The RightTolLeft property affects all columns, and future columns being added. 

Changing the RightToLeft property on True does the following:

• displays the vertical scroll bar on the left side of the control ( Scrollbars property )
• flips the order of the columns ( Position property )
• change the column's alignment to right, if the column is not centered ( Alignment property, HeaderAlignment property, HeaderImageAlignment property )
• reverse the order of the drawing parts in the cells ( Def(exCellDrawPartsOrder) property to "caption,picture,icons,icon,check" )
• aligns the locked columns to the right ( CountLockedColumns property )
• aligns the control's group-by bar / sort bar to the right ( SortBarVisible property )
• the control's filter bar/prompt/close is aligned to the right ( FilterBarPromptVisible property )

The following screen shot shows how the control looks if the RightToLeft property is True:

(By default) Changing the RightToLeft property on False does the following:

• displays the vertical scroll bar on the right side of the control ( Scrollbars property )
• flips the order of the columns ( Position property )
• change the column's alignment to left, if the column is not centered ( Alignment property, HeaderAlignment property, HeaderImageAlignment property )
• reverse the order of the drawing parts in the cells ( Def(exCellDrawPartsOrder) property to "check,icon,icons,picture,caption" )
• aligns the locked columns to the left ( CountLockedColumns property )
• aligns the control's group-by bar / sort bar to the left ( SortBarVisible property )
• the control's filter bar/prompt/close is aligned to the left ( FilterBarPromptVisible property )

The following screen shot shows how the control looks if the RightToLeft property is False:

The following VB sample shows how to change the order of the columns from right to left

With Tree1
	.BeginUpdate 
	.ScrollBars = exDisableBoth
	.LinesAtRoot = exLinesAtRoot
	With .Columns.Add("P1")
		.Def(exCellHasCheckBox) = True
		.PartialCheck = True
	End With
	With .Items
		h = .AddItem("Root")
		.InsertItem h,0,"Child 1"
		.InsertItem h,0,"Child 2"
		.ExpandItem(h) = True
	End With
	.RightToLeft = True
	.EndUpdate 
End With

The following VB.NET sample shows how to change the order of the columns from right to left

Dim h
With AxTree1
	.BeginUpdate 
	.ScrollBars = EXTREELib.ScrollBarsEnum.exDisableBoth
	.LinesAtRoot = EXTREELib.LinesAtRootEnum.exLinesAtRoot
	With .Columns.Add("P1")
		.Def(EXTREELib.DefColumnEnum.exCellHasCheckBox) = True
		.PartialCheck = True
	End With
	With .Items
		h = .AddItem("Root")
		.InsertItem h,0,"Child 1"
		.InsertItem h,0,"Child 2"
		.ExpandItem(h) = True
	End With
	.RightToLeft = True
	.EndUpdate 
End With

The following C++ sample shows how to change the order of the columns from right to left

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

	#import <ExTree.dll>
	using namespace EXTREELib;
*/
EXTREELib::ITreePtr spTree1 = GetDlgItem(IDC_TREE1)->GetControlUnknown();
spTree1->BeginUpdate();
spTree1->PutScrollBars(EXTREELib::exDisableBoth);
spTree1->PutLinesAtRoot(EXTREELib::exLinesAtRoot);
EXTREELib::IColumnPtr var_Column = ((EXTREELib::IColumnPtr)(spTree1->GetColumns()->Add(L"P1")));
	var_Column->PutDef(EXTREELib::exCellHasCheckBox,VARIANT_TRUE);
	var_Column->PutPartialCheck(VARIANT_TRUE);
EXTREELib::IItemsPtr var_Items = spTree1->GetItems();
	long h = var_Items->AddItem("Root");
	var_Items->InsertItem(h,long(0),"Child 1");
	var_Items->InsertItem(h,long(0),"Child 2");
	var_Items->PutExpandItem(h,VARIANT_TRUE);
spTree1->PutRightToLeft(VARIANT_TRUE);
spTree1->EndUpdate();

The following C# sample shows how to change the order of the columns from right to left

axTree1.BeginUpdate();
axTree1.ScrollBars = EXTREELib.ScrollBarsEnum.exDisableBoth;
axTree1.LinesAtRoot = EXTREELib.LinesAtRootEnum.exLinesAtRoot;
EXTREELib.Column var_Column = (axTree1.Columns.Add("P1") as EXTREELib.Column);
	var_Column.set_Def(EXTREELib.DefColumnEnum.exCellHasCheckBox,true);
	var_Column.PartialCheck = true;
EXTREELib.Items var_Items = axTree1.Items;
	int h = var_Items.AddItem("Root");
	var_Items.InsertItem(h,0,"Child 1");
	var_Items.InsertItem(h,0,"Child 2");
	var_Items.set_ExpandItem(h,true);
axTree1.RightToLeft = true;
axTree1.EndUpdate();

The following VFP sample shows how to change the order of the columns from right to left

with thisform.Tree1
	.BeginUpdate
	.ScrollBars = 15
	.LinesAtRoot = -1
	with .Columns.Add("P1")
		.Def(0) = .T.
		.PartialCheck = .T.
	endwith
	with .Items
		h = .AddItem("Root")
		.InsertItem(h,0,"Child 1")
		.InsertItem(h,0,"Child 2")
		.DefaultItem = h
		.ExpandItem(0) = .T.
	endwith
	.RightToLeft = .T.
	.EndUpdate
endwith

The following Delphi sample shows how to change the order of the columns from right to left

with AxTree1 do
begin
	BeginUpdate();
	ScrollBars := EXTREELib.ScrollBarsEnum.exDisableBoth;
	LinesAtRoot := EXTREELib.LinesAtRootEnum.exLinesAtRoot;
	with (Columns.Add('P1') as EXTREELib.Column) do
	begin
		Def[EXTREELib.DefColumnEnum.exCellHasCheckBox] := TObject(True);
		PartialCheck := True;
	end;
	with Items do
	begin
		h := AddItem('Root');
		InsertItem(h,TObject(0),'Child 1');
		InsertItem(h,TObject(0),'Child 2');
		ExpandItem[h] := True;
	end;
	RightToLeft := True;
	EndUpdate();
end