Header file

caf::PdmField< bool >   m_pickPointsEnabled;

Constructor

CAF_PDM_InitField(&m_pickPointsEnabled, "m_pickPointsEnabled", false, "", "", "", "");
caf::PdmUiPushButtonEditor::configureEditorForField(&m_pickPointsEnabled);

FieldChangedByUI

if (changedField == &m_pickPointsEnabled)
{
    if (m_pickPointsEnabled)
    {
        // Do command stuff
    }
    
    // If it is supposed to be a push button, reset it
    m_pickPointsEnabled = false;
}

defineEditorAttribute

if (field == &m_pickPointsEnabled)
{
    caf::PdmUiPushButtonEditorAttribute* pbAttribute = dynamic_cast<caf::PdmUiPushButtonEditorAttribute*>(attribute);
    if (pbAttribute) pbAttribute->m_buttonText = "Stop picking points";
}