How to define wait() if the class is object rather than gr_top.block?

Dear All,

In file, class radar_rx(gr.top_block) and class
radar_tx(object) are defined. I would like to add a wait() function for
radar_rx and radar_tx.

In class radar_rx(gr.top_block), radar_rx is under gr.top_block class,
so I
can define wait() as:
def rx_wait(self):

However, radar_tx is defined as object, not the gr.top_block, how should
define wait() function for radar_tx?

Thanks in advance,

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