$B^+ \rightarrow D^0 K^+$ decays at CDFII

The measurement of BRs and asymmetries of $B^\pm \rightarrow D0 K^\pm$ modes is a theoretically clean method for the determination of the CKM angle $\gamma$. We present first results of the analysis of these modes at a hadron collider, from a sample of 360 pb$^-1$ of data collected with the CDFII detector at the Tevatron collider at Fermilab.