The Description property defines the default caption to be displayed on giving UI part of the control. For instance, you can use the Description property to change the "All" caption being displayed on the groups filter. 

The following samples translate "All" in the drop down filter of the groups to "Todos":

VBA (MS Access, Excell...)

With Schedule1
	.Description(0) = "(todos)"
	.DisplayGroupingButton = True
	.ShowGroupingEvents = True
	.Groups.Add 1,"Pro"
End With

VB6

With Schedule1
	.Description(exGroupBarAll) = "(todos)"
	.DisplayGroupingButton = True
	.ShowGroupingEvents = True
	.Groups.Add 1,"Pro"
End With

VB.NET

With Exschedule1
	.set_Description(exontrol.EXSCHEDULELib.DescriptionTypeEnum.exGroupBarAll,"(todos)")
	.DisplayGroupingButton = True
	.ShowGroupingEvents = True
	.Groups.Add(1,"Pro")
End With

VB.NET for /COM

With AxSchedule1
	.set_Description(EXSCHEDULELib.DescriptionTypeEnum.exGroupBarAll,"(todos)")
	.DisplayGroupingButton = True
	.ShowGroupingEvents = True
	.Groups.Add(1,"Pro")
End With

C++

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

	#import <ExSchedule.dll>
	using namespace EXSCHEDULELib;
*/
EXSCHEDULELib::ISchedulePtr spSchedule1 = GetDlgItem(IDC_SCHEDULE1)->GetControlUnknown();
spSchedule1->PutDescription(EXSCHEDULELib::exGroupBarAll,L"(todos)");
spSchedule1->PutDisplayGroupingButton(VARIANT_TRUE);
spSchedule1->PutShowGroupingEvents(VARIANT_TRUE);
spSchedule1->GetGroups()->Add(1,L"Pro");

C++ Builder

Schedule1->Description[Exschedulelib_tlb::DescriptionTypeEnum::exGroupBarAll] = L"(todos)";
Schedule1->DisplayGroupingButton = true;
Schedule1->ShowGroupingEvents = true;
Schedule1->Groups->Add(1,L"Pro");

C#

exschedule1.set_Description(exontrol.EXSCHEDULELib.DescriptionTypeEnum.exGroupBarAll,"(todos)");
exschedule1.DisplayGroupingButton = true;
exschedule1.ShowGroupingEvents = true;
exschedule1.Groups.Add(1,"Pro");

JavaScript

<OBJECT classid="clsid:9B09E13D-7A88-4299-9DBE-383380435377" id="Schedule1"></OBJECT>

<SCRIPT LANGUAGE="JScript">
	Schedule1.Description(0) = "(todos)";
	Schedule1.DisplayGroupingButton = true;
	Schedule1.ShowGroupingEvents = true;
	Schedule1.Groups.Add(1,"Pro");
</SCRIPT>

C# for /COM

axSchedule1.set_Description(EXSCHEDULELib.DescriptionTypeEnum.exGroupBarAll,"(todos)");
axSchedule1.DisplayGroupingButton = true;
axSchedule1.ShowGroupingEvents = true;
axSchedule1.Groups.Add(1,"Pro");

X++ (Dynamics Ax 2009)

public void init()
{
	;

	super();

	exschedule1.Description(0/*exGroupBarAll*/,"(todos)");
	exschedule1.DisplayGroupingButton(true);
	exschedule1.ShowGroupingEvents(true);
	exschedule1.Groups().Add(1,"Pro");
}

Delphi 8 (.NET only)

with AxSchedule1 do
begin
	set_Description(EXSCHEDULELib.DescriptionTypeEnum.exGroupBarAll,'(todos)');
	DisplayGroupingButton := True;
	ShowGroupingEvents := True;
	Groups.Add(1,'Pro');
end

Delphi (standard)

with Schedule1 do
begin
	Description[EXSCHEDULELib_TLB.exGroupBarAll] := '(todos)';
	DisplayGroupingButton := True;
	ShowGroupingEvents := True;
	Groups.Add(1,'Pro');
end

VFP

with thisform.Schedule1
	.Object.Description(0) = "(todos)"
	.DisplayGroupingButton = .T.
	.ShowGroupingEvents = .T.
	.Groups.Add(1,"Pro")
endwith

dBASE Plus

local oSchedule

oSchedule = form.Activex1.nativeObject
oSchedule.Template = [Description(0) = "(todos)"] // oSchedule.Description(0) = "(todos)"
oSchedule.DisplayGroupingButton = true
oSchedule.ShowGroupingEvents = true
oSchedule.Groups.Add(1,"Pro")

XBasic (Alpha Five)

Dim oSchedule as P

oSchedule = topparent:CONTROL_ACTIVEX1.activex
oSchedule.Template = "Description(0) = \"(todos)\"" ' oSchedule.Description(0) = "(todos)"
oSchedule.DisplayGroupingButton = .t.
oSchedule.ShowGroupingEvents = .t.
oSchedule.Groups.Add(1,"Pro")

Visual Objects

oDCOCX_Exontrol1:[Description,exGroupBarAll] := "(todos)"
oDCOCX_Exontrol1:DisplayGroupingButton := true
oDCOCX_Exontrol1:ShowGroupingEvents := true
oDCOCX_Exontrol1:Groups:Add(1,"Pro")

PowerBuilder

OleObject oSchedule

oSchedule = ole_1.Object
oSchedule.Description(0,"(todos)")
oSchedule.DisplayGroupingButton = true
oSchedule.ShowGroupingEvents = true
oSchedule.Groups.Add(1,"Pro")