valueSetExpression  
  Stores the given GtkExpression inside value.
The GValue will acquire a reference to the expression.
Parameters
value
a GValue initialized with type GTK_TYPE_EXPRESSION
expression
a GtkExpression
Stores the given GtkExpression inside value.
The GValue will acquire a reference to the expression.
a GValue initialized with type GTK_TYPE_EXPRESSION
a GtkExpression