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String | 
A string expression that defines the horizontal and vertical margins (separated
by comma) of the control's tooltip as one of the following formats:
  - "value", where value is a positive number, that specifies the
    horizontal and vertical margins, such as "4"
    equivalent of "4,4"
 
  - "value,", where value is a positive number, that specifies the
    horizontal margin, such as "4,"
    equivalent of "4,0"
 
  - ",value", where value is a positive number, that specifies the
    vertical margin, such as ",4"
    equivalent of "0,4"
 
  - "horizontal,vertical", where horizontal and vertical are
    positive numbers, that specifies the horizontal and vertical margins, such
    as "4,4"
 
 
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