Problem with binding between task and method container.

Dear All,

I have created a custom method in ZZbu2012 and delegated to bus2012.

During method creation,I selected synchronous and result parameter check box.

This custom method picks two agents from Ztable based on plant.

I integrated this method with a task.Now I want to do binding between task and method container.

But the green color button for binding object method does not appears.

Please help me for which I will be grateful.

Thanks and regards,

S.Suresh