Currently I am facing problem within my apex compnent while adding disable attribute its irregular behaviour.

<apex:pageBlock rendered="{!page1visible}">

<apex:column >

<apex:outputLabel value="Product Name: "></apex:outputLabel>

<apex:selectList title="Product Name" multiselect="false" size="1" value="{!lst.Names}" disabled="{!page1disable}">

<apex:selectOptions value="{!lsttickets}"></apex:selectOptions>

</apex:selectList>

</apex:column>
<apex:commandButton value="Add More" action="{!addRows}" disabled="{!page1disable}"/>

<apex:commandButton value="Save and Next" action="{!groupsalesp1}" disabled="{!page1disable}"/> 

</apex:pageBlock>

<apex:pageBlock rendered="{!page2visible}">

<apex:column >

<apex:outputLabel value="Product Name: "></apex:outputLabel>

<apex:selectList title="Product Name" multiselect="false" size="1" value="{!lst.Names}" disabled="{!page2disable}">

<apex:selectOptions value="{!lstpark}"></apex:selectOptions>

</apex:selectList>

</apex:column>
<apex:commandButton value="Add More" action="{!addrows}" disabled="{!page2disable}"/>

<apex:commandButton value="Save and Next" action="{!salesp2}" disabled="{!page2disable}"/> 

</apex:pageBlock>

its working fine with first pageblock and disabling fields for correctly after that in next Apex:pageblock its not even able to call action functions in apex:commandbutton 

What I actually want is that I need to make first pageblock readonly while clicking on Save and Next button on first pageblock and then second page block and so on while moving to next pageblock it should make first one as readonly 

Any sugguestions and different approach ?