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ComboBox control not working in MT4?

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kieran.w
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kieran.w  

Does anyone have any experience in using the ComboBox control?  

I'm trying to use the ComboBox control that is part of the standard MQL4 library. Creating it is very simple, but when I click it to open the list, it doesn't open.

I do .Create, then .AddItem a few times, and it shows fine on the chart, except that when I click it to show the list of items it doesn't do anything.

It's working fine in MT5, just not in MT4.

I have only been able to find the page below: 

https://www.mql5.com/en/docs/standardlibrary/controls/ccombobox 

Since it's included in the standard MQL4 library I can only assume that it's supposed to work?

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