Is this a memory leak

Is this a memory leak

SrchItemEditDetail is a frame
PageSearchFieldEnumMV is a Page
Below is called many times
private void Revise_Helper(FieldDef SearchFieldSelected, enumAndOr
paramAndOr)
{
PageSearchFieldEnumMV nextPage = new
PageSearchFieldEnumMV(SearchFieldSelected, paramAndOr);
SrchItemEditDetail.Content = nextPage;
}
Other methods fill SrchItemEditDetail.Content with other Pages.
Is this a memory leak?
If so can I fix it with
SrchItemEditDetail.Content = null;