In order to achieve this look for the RadFilter control you should use custom skin. With this custom skin you could position the elements of the control in the arrangement you would like. You could set display:none for the elements of the RadFilter you would like to be hidden. If you would like you could check the typical HTML output of a RadFilter control here
. Note that displaying the context menu setting the operand in the expression (Equal to, Contains, etc.) as RadComboBox would be hard to achieve.
Another approach is to manually create the controls and collect the values entered by the user. Then you could use this data to create a custom filter expression. You could find additional information on manually building filter expressions in this article
I hope this information would be helpful to you.
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