wrap by '.input-group-addon' support.

`
				<div class="form-group">
					<div class="col-md-10 col-sm-10">
						<div class="input-group">
							<span class="input-group-addon input-group-addon-bootstrap-select">
								<select name="" id="" class="selectpicker ">
									<option value="" data-content=''></option>
								</select>
							</span>
							<input type="text" placeholder="" class="form-control" >
						</div>
					</div>
				</div>

`