I am trying to set different colors of tasks in tree view based on stage: ie. blue for open tasks, green for completed tasks.

Stages:
Open (id:1),
Completed (id:6),
Cancelled (id:7)

When i try this (just to check)

colors="blue:stage_id != 1

it turns every task blue including the Open tasks! So, I am not using the correct stage_id for this to work?

Here is the full xml:

<?xml version="1.0"?>
    <tree default_order="x_start_date asc" fonts="bold:message_unread==True" colors="blue:stage_id != 1;" string="Tasks">
                            <field name="message_unread" invisible="1"/>
                            <field name="sequence" invisible="not context.get('seq_visible', False)"/>
         <field name="name"/>
                            <field name="project_id" invisible="context.get('user_invisible', False)" string="PO#"/>
                            <field name="user_id" invisible="context.get('user_invisible', False)"/>
                            <field name="delegated_user_id" invisible="context.get('show_delegated', True)"/>
                            <field name="total_hours" invisible="1"/>
                            <field name="planned_hours" invisible="context.get('set_visible',False)" groups="project.group_time_work_estimation_tasks"/>
                            <field name="effective_hours" widget="float_time" sum="Spent Hours" invisible="1"/>
                            <field name="remaining_hours" widget="float_time" sum="Remaining Hours" on_change="onchange_remaining(remaining_hours,planned_hours)" invisible="context.get('set_visible',False)" groups="project.group_time_work_estimation_tasks"/>
         <field name="date_deadline" invisible="context.get('deadline_visible',True)"/>                  
         <field name="stage_id" invisible="context.get('set_visible',False)" string="Task Status"/>
 </tree>