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I wrote a widget, and make the method "allow_template" return true when $template is equal to "custom", then i select then checkbox of the widget to be displayed on my custom page, However, my custom page can't display this widget. why?
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Can you make it appear on any other pages? If not, it may be there is some problem with the widget not related to custom pages.

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qa-page-admin-widgets.php file contains an array named: $templatelangkeys that is instantiated on line 72 (in my source).

$templatelangkeys contains a list of all avaliable pages (or "template" as they're referred to) that is displayed on the Admin -> Layout -> Add Widget page when selecting what template your widget is permitted to appear on.

You also must allow the widget plugin to display on this template through the widget's allow_template() method. (as you have noticed)

Important note:
I haven't yet found a method to register a new template that references the custom page plugin (and it doesn't appear to do so automativally). If a method does not exist (I hven't found one) then you will need to hand edit the $templatelangkeys array when you want a custom widget plugin on a custom page.

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