<ctrlPr> (Control Properties)
This element specifies properties on control characters; that is, object characters that cannot be selected. Examples of control characters are n-ary operators (excluding their limits and bases), fraction bars (excluding the numerator and denominator), and grouping characters (excluding the base). <ctrlPr> allows formatting properties to be stored on these control characters. The control character inherits its formatting from the paragraph formatting; <ctrlPr >contains the formatting differences between the control character and the paragraph formatting. 
<m:ctrlPr>
  <w:rPr>
    <w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/>
  </w:rPr>
</m:ctrlPr>
@CtrlPr is also used to save properties on characters used in the Linear representation of an equation, that are not displayed in the Professional form. For example, the linear string ∫_0^1 might have color on the _ or ^. Though these characters are not displayed in Professional form, their formatting is stored.
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The following XML Schema fragment defines the contents of this element:
<complexType name="CT_CtrlPr">
	<sequence>
	<group ref="w:EG_RPrMath" minOccurs="0"/>
	</sequence>
</complexType>