A possible workaround could be a short javascript code that opens the Grid Combo on hitting the ENTER key after you navigated to the field.
Be aware that this workaround isn't supported by FOEX and won't work any more with FOEX 3.0 onwards or custom themes!
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Create a dynamic action on the Grid Combo Field with
Event: Key Down
and a JavaScript Condition: (this.browserEvent && this.browserEvent.keyCode === 13)
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Create a true action "Execute JavaScript Code"
Code: $("#your_grid_combo_page_item_name").find("div.x-trigger-index-1").click()
Explanation of the class in the find:
div.x-trigger-index-1 = class of the open button
Example configuration:
Event:
True Action:
