Combo Box cant multi selected

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Hi Expert, Recently, I 'm developing multi select function, I refer to the Combobox widget to achieve the function. However, the function only can select one item. I'm not sure if any wrong on setting or not . Can you give me a direction for this? Thanks a lot. I expect it should be like below :(  
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1 answers
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Hi Andy,

 

Is your accociation you use for the datasource a reference set? It needs to be a M:M association to support your required behavior. 

 

For more detailed info please refer to the documentation: https://docs.mendix.com/appstore/widgets/combobox/#213-multi-selection-reference-set

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