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I need to hide some columns in my detail table when exporting (pdf and print).
Alternatively if there's a way to remove links in the detail table when exporting that would also be OK.
I tried using this in Page_Load of the Preview page and List page of the detail table:

    if (IsExport("pdf")){
        $this->myField->Exportable = false; 
    } 

but it doesn't seem to do anything...

Simply change Exportable to Visible, and try again.

Tried that, it didn't work
I have this in List page

public function pageLoad()
    {
        //Log("Page Load");
    if (IsExport("pdf") || IsExport("print")){
        $this->fk_IncidentID->Visible = false;
        $this->Filename->Visible = false;    
    }		
    }

Strange - I added this to Page_Load of the generated Grid page and the fields are now correctly hidden from print export, but they are still there in pdf export...

For Export to PDF, you should use isExport() method that belongs to the current page, instead of IsExport() global function.

So, your code should be:

public function pageLoad()
{
    //Log("Page Load");
    if ($this->isExport("pdf") || IsExport("print")){
        $this->fk_IncidentID->Visible = false;
        $this->Filename->Visible = false;    
    }		
}