How to place footer button in Value help dialog?

Hi All,

I have created a Value help dialog and I want to place a button left to the cancel button. I'm using "buttons" aggregation but it places the button on the right. Is there a way that I can completely remove the default cancel button from Value Help Dialog and define my custom buttons or any custom button can be placed on left hand side?
Attaching screenshot for the same.

<ValueHelpDialog title="Solutioning Request" ok=".onSolVerCreateValueHelpOkPress" cancel=".onSolVerCreateValueHelpCancelPress" afterClose=".onSolVerCreateValueHelpAfterClose" supportMultiselect="false" supportRanges="false" key="SOLREQID" descriptionKey="SOLREQNAM">

<buttons> <m:Button text="Create New SV" id="idCreateNewSV" press="onNavtoCreateSV"/> </buttons> </ValueHelpDialog>