how to refresh jComboBox in popupMenuWillBecomeVisible

hello,
i have jComboBox which should calculate its drop-down list size before
opening (it depends on current window size so I decide to put it into
popupMenuWillBecomeVisible method)

void jComboParamNames_popupMenuWillBecomeVisible(PopupMenuEvent e) {
int rowCount = 30; // sample for testing purposes...
myCombo.setMaximumRowCount(rowCount);
// how to refresh combo???
}

Desired size of drop down list will appear... after second click on the
comboBox. Is it possible to refresh it in popupMenuWillBecomeVisible
before showing drop-down list?

thanks
T.

.

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