Bootstrap v3.3.0 - Update Multiple Select checkbox with JQuery : data-plugin-multiselect

I have a drop down multi-checkbox selection, sample below:

<div class="form-group">
            <label class="col-md-3 control-label">PG</label>
            <div class="col-md-9">
                <select class="form-control" multiple="multiple" data-plugin-multiselect 
data-plugin-options='{ "enableCaseInsensitiveFiltering": true }' id="sel_pg">
                        <option value="ALL" selected="selected">ALL Data</option>
                        <option value="A">A - Data 1</option>
                        <option value="B">B - Data 2</option>
                        <option value="C">C - Data 3</option>
                </select>
            </div>
        </div>

I have saved selection on my database, Eg:

Event 1 : I will have Value A automatically checked.

Event 2 : I will have Value A and B automatically checked

Note: Check boxes need to be ticked + correct message title

Who this can be done using JQuery?

Thanks.

Regards,

Jason