Add-on toolbar is not displayed for a pdf package

Question

The add-on toolbar have started not to be displayed in Adobe Acrobat for a pdf package since I created a new plug-in. The new plug-in put the coversheet on the front of the package when the pdf package is open.
I was testing and found out that the following method (included in my plug-in code) is making the add-on toolbar hiddenCosDictRemove(cosColl,ASAtomFromString("D"));
This is part of my code:CosDoc cosDoc = PDDocGetCosDoc(pdDoc);
CosObj cosCat = CosDocGetRoot(cosDoc);
CosObj cosColl = CosDictGet(cosCat,ASAtomFromString( 
"Collection"));  
if(CosObjGetType(cosColl) == CosDict){
if(CosDictKnown(cosColl,ASAtomFromString("D"))){
CosDictRemove(cosColl,ASAtomFromString( 
"D"));}
bRtn = TRUE;
I need to enable the add-on toolbar programmatically. I have tried to enable the toolbar using the code shown below but it didn't work. I don't know what else to do. Please could you help me out?.
Thanks,
ACCB1 ASBool MyToolBarComputeVisibleProc (void *clientData)
{ return true
ACCB1 ASBool MyToolButtonEnumProc (AVToolButton button, void * clientData)
if (button != NULL)
AVToolButtonSetComputeVisibleProc(button, MyToolBarComputeVisibleProc, NULL);
return true;
BOOL SetCoverPageDisplay(void *clientData){
AVToolBar objToolbar = AVAppGetToolBarByName("JSAppToolBar");
if (objToolbar != NULL)
AVToolBarEnumButtons(objToolbar, MyToolButtonEnumProc, NULL);
AVToolBarUpdateButtonStates(objToolbar);
return true

Answer 1

Hi,
As I need the add-on toolbar to appear when a package is open, is there any way to make the add-on toolbar visible programmatically?.
Thanks in advance