Captain Shakib Al Hasan has vowed to keep his emotions under control after heated altercations and ugly scenes marred Bangladesh's dramatic win over Sri Lanka in a must-win game of the Nidahas Twenty20 Tri-Series here. In the virtual semi-final last night, Bangladesh defeated hosts Sri Lanka by two wickets to set-up a clash against India in tomorrow's final. But the thrilling game was marred by ugly scenes after the on-field umpires had refused to award a no-ball when Isuru Udana delivered a second short-pitched delivery with Sri Lanka needing 12 runs of the final over at the R Premadasa Stadium.