how to fill color for ichimoku cloud?

 

Hi I Start study about MQL4 and MQL5 and I want create Ichimoku for tutorial, But the kumo not fill color as I want. I user the histogram but the final result not work correctly.

this is my code:

 SenkuABuffer[i] = (T + K)/2;
      highest = high[ArrayMaximum(high,i,SenkuB)];
      lowest = low[ArrayMinimum(low,i,SenkuB)];
      SenkuBBuffer[i] = (highest+lowest)/2;
      RedKumoBuffer[i]  =  SenkuBBuffer[i];
      GreenKumoBuffer[i]=SenkuABuffer[i];

and the image is the chart result.

how can i fix the histogram to only fill the cloud?

Files: