How to set event microflow call type as Synchronous for blocking progress on widget

We have a custom widget with below show progress logic. var r = mx.ui.showProgress("", !0); e.props.onBlur.execute(), mx.ui.hideProgress(r)   This works fine but, its not synchronous. When multiple events triggered, like user entered value in textbox (custom widget with on change event) and directly clicking on save button, which will trigger multiple events. In this case we want to execute Save event after execution of custom widget on change event.
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