[vtkusers] changing the caption text while it is running, vtkCaptionWidget

[circass]

Here is my code 


vtkCaptionWidget *m_capWidget = vtkCaptionWidget::New();
vtkCaptionActor2D *Dactor = vtkCaptionActor2D::New();

Dactor->SetCaption("!!!Test Warning!!!");

m_capWidget->SetCaptionActor2D(Dactor);
m_capWidget->SetSelectable(321);
m_absWidget = m_capWidget;

m_absWidget->CreateDefaultRepresentation();
m_absWidget->AddObserver(vtkCommand::StartInteractionEvent,
StartInteractionCallBack::New());
m_absWidget->AddObserver(vtkCommand::EndInteractionEvent,
EndInteractionCallBack::New());


My problem is not set the caption text. I wanted to allow users to change
the text but this is not my prior problem for now. 

My proior problem is :

i cant see the arrow part of the widget when i turn it on. in saggital view
i see the arrow part but in axial and coronal views i cant. So i m asking
that how can i set the plane orientation of this caption widget ?
there must be something. 
i can see the arrow part when i use volume data but i cant when i use 2D. 
this is my problem ...

Thanx
Circass

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