Deactivate Button on Custom Entity does not execute.

Hi,

I want to enable a 'Deactivate' button   for a custom entity at the form level. This is my first ribbon button , so I might be missing something.

I can see the Button ok, but it doesn't seem to execute  when I click on it.

Any debugging  steps I can take to track this down ?

I am in the system admin group.I don't see any obvious errors in CMR log.I am using CRM 2011 on Premise.

Thanks,Peter

Here is the section from the customizations.xml :

<CustomAction Id="Sample.Form.new_CustomEntity.CustomAction" Location="Mscrm.Form.new_CustomEntity.Deactivate" Sequence="61"><CommandUIDefinition><Button Id="Mscrm.Form.new_CustomEntity.Deactivate" ToolTipTitle="$LocLabels:All.Deactivate.LabelText.ToolTip" ToolTipDescription="$LocLabels:All.Deactivate.LabelText.ToolTip" Command="Mscrm.Form.Deactivate" LabelText="$LocLabels:All.Deactivate.LabelText" Image16by16="/_imgs/ribbon/deactivate16.png" Image32by32="/_imgs/ribbon/Deactivate_32.png" TemplateAlias="o2" /></CommandUIDefinition></CustomAction>  
....<CommandDefinitions><CommandDefinition Id="Mscrm.Form.Deactivate"><EnableRules ><EnableRule Id="Mscrm.CanWritePrimary" /></EnableRules ><DisplayRules><DisplayRule Id="Mscrm.CanWritePrimary" /><DisplayRule Id="Mscrm.PrimaryIsActive" /><DisplayRule Id="Mscrm.PrimaryEntityHasStatecode" /><DisplayRule Id="Mscrm.PrimaryIsNotActivity" /></DisplayRules><Actions /></CommandDefinition></CommandDefinitions>