How to calculate cumulative sum of a measure

[Cevola]

I need to calculate cumulative sum of Pictures per site

Picture per site is a measure which is straight count of index column.

Site Score is also a measure.

I need a new measure which should calculate the cumulative sum of Pictures per site for site score in descending order.

Thank you

[wdx223_Daniel]

CumSum=SUMX(WINDOW(0,ABS,0,REL,ADDCOLUMN(ALLSELECTED(Table[Site/Link]),"@SiteScore",[Site Score]),,ORDERBY([@SiteScore],DESC,Table[Site/Link],ASC)),[Pictures per Site])