Is there any chance to provide data to inargument type of dictionary<string, string> in designer activity?

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I'm creating a activity (windows workflow foundation) for Mail Template with right click options (Context menu), in this part i have to provide dynamic data as dictionary for the activity as InArgument, here i have a variable dictionary CMenu and i can able to set the variable to the InArgument property, the problem is i am unable read the data in designer activity, guys can any one can able to assist me to solve this?

What I have tried:

I have tried below //CodeActivity public Dictionary ContextMenu { get; set; } Create a variable in UI and set it to the particular property //Designer Activity this.ModelItem.Properties["ContextMenu"].Dictionary.Keys