SET DEFAULT STORE VIEW FOR CATEGORY AND PRODUCT LIST IN ADMIN MAGENTO

adminhtml/default/default/template/store/switcher.phtml

CHANGE  THE FOLLOWING LINE OF  CODE

<option value="<?php echo $store->getId() ?>"<?php if($this->getStoreId() == $store->getId()): ?> selected="selected"<?php endif; ?>>&nbsp;&nbsp;&nbsp;&nbsp;<?php echo $store->getName() ?></option>

TO


<option value="<?php echo $store->getId() ?>"<?php if($this->getStoreId() == $store->getId()): ?> selected="selected"<?php elseif($store->getId()==4):echo "selected='selected'"; endif; ?>>&nbsp;&nbsp;&nbsp;&nbsp;<?php echo $store->getName() ?></option>